Testo factsheet Calibration

What is calibration? ISO certificates Calibration is the recording and documentation of the deviation of a (factory certificates) in comparison to another, traceable instrument with a higher accuracy, under prescribed conditions. This instrument is described as the .

What is adjustment? Adjustment is the setting of a value to the smallest possi- ble deviation from the correct value. In adjustment, a interference with the instrument is necessary.

Standards and traceability Normal: Material measure, measuring instrument, reference material or measuring equipment with the purpose of specifying, embodying, main- taining or reproducing a unit or one or more parameter values.

Metrological traceability The property of a measurement result or the measurement value of a standard to be traceable to suitable standards – as a rule international or national standards, by an uninterrupted chain of comparative with given measurement uncertainties.

ISO calibrations are used in all areas in which test device monitoring and calibration are required but DAkkS calibrations are not. They satisfy the requirements of: PTB National • ISO 9001:2015 • CFR • VDA standard • ISO 10012-2003 • ISO 13485 • GMP • ISO 9001:2008 • HACCP/ LMHV Primary laboratory Testo Industrial Services

Accredited Accredited calibration 1 calibration laboratory Reference standard certificates E.g.: DAkkS (D), Accreditation Austria (ÖKD, A), SCS (CH), UKAS (GB), In-house NVLAP (US) 2 calibration laboratory Working/factory standard Accredited calibration certificates may only be issued by calibration and test laboratories whose expertise to carry out calibrations according Operational test equipment to DIN EN ISO/IEC 17025 has been recognized. The calibration results achieved in these laboratories are the most highly reliable - after those of the state institutions (in Germany the PTB) - and are binding in courts. International conventions and DIN EN ISO/IEC 17025, the globally applicable accreditation basis, ensure that they are recognized and valid 1 Reference standard: 2 Working/factory standard: internationally. The standard, usually with the Routinely used standard for the highest available accuracy calibration/testing of material DAkkS calibration certificates are the ideal solution for all users of at an observed point or in measures, measuring instruments measuring instruments who require a particularly high degree of safety, an organisation, from which or reference materials. A working accuracy and reliability. Test equipment in the following sectors is often measurements are derived. standard is usually calibrated with covered by DAkkS certificates: the aid of a reference standard.

• Factory and working standards • Pharmaceuticals • Medical technology • Approval and certification bodies • Expert assessors • Testing laboratories • IATF 16949-certified companies • Accredited test and calibation laboratories

We look forward to your questions. Reach out to us: www.testo.com.au • [email protected] • 1300 837 861 Testo factsheet calibration

Calibration interval

In order to achieve correct measurements in the long term, and to trust A parameter associated with the result of a measurement, which charac- the required test equipment, it must be calibrated at regular intervals. terises the dispersion of values which could be attributed to the meas- These intervals from one calibration to the next are known as the cali- urement parameter, or: The estimated value for characterizing a range of bration interval or monitoring interval. The length of this period can be values, within which the true value of the measurement parameter lies. individually determined by the user, and depends, for example, on: There are many factors which influence the measurement uncertainty.

• Recommendation of calibration laboratories (normally yearly) It is assumed that the measurement result is the best estimate for the • Specifications of the measuring instrument manufacturer value of the measurement parameter, and that all components of the • Required measurement uncertainties uncertainty contribute to the dispersion – including those which derive • Specifications of standards and guidelines from systematic influences, e.g. such as those deriving from corrections • Specifications of third parties and reference standards. • Operating conditions of test equipment • Frequency of use On this topic, see: Guide to the expression of uncertainty in measure- ment (GUM).

Calibration points The “dartboard explanation”:

Enough calibration points should always be chosen so that reliable statements can be made on the measurement behaviour and the working range of the instrument. The calibration points should be close to the working range of the test equipment. “Value/measurement uncertainty”

Example: calibration: Three calibration points True value 0,1 0,2 0,3 distributed across the entire area of use. If a temperature probe is -0,3-0,2 -0,1 monitoring a temperature control process in the range of 50 to 250 °C, Measurement value the following three calibration points can be selected. There is no such thing Target values in °C as absolute accuracy!

350

300 In a game of darts, you will never hit the exact centre. Occasionally the Upper process point 250 dart finds its way to the bullseye, but very often you hit the board around it. The darts which have not gone into the bullseye represent the uncer- 200 Process point in the centre of tainty in throwing i.e. the uncertainty of the darts player. the calibration range 150 The measurement uncertainty is influenced by the calibration object, the measurement equipment, the persons, the measurement method and the 100 Lowest process ambient conditions. point 50

0 0 50 100 150 200 49.5 149 250 Actual values in °C

Calibration with Testo – Testo – your partner your advantages at a glance: for calibration

• Avoidance of rejects and rectification work Calibration of your measuring instruments in accredited • Fulfilment of norms, guidelines and standards laboratories • Protection from potential compensation claims • Secure measurement results thanks to highly accurate calibration – • Audit security traceable to national or international standards • Depending on your requirements, you receive accredited or ISO calibrations • Benefit from 60 years of experience in measurement technology and calibration

We look forward to your questions. Reach out to us: www.testo.com.au • [email protected] • 1300 837 861